@keyframes Blink {
  0% {
    opacity: 0.5;
  }
  100% {
    opacity: 1;
  }
}

.keyframes {
  &.blink {
    animation-name: Blink;
    animation-duration: 0.5s;
    animation-iteration-count: infinite;
    animation-direction: alternate;
    animation-timing-function: ease-in-out;
  }
}